Merchants using 3dcart's Fulfillment by Amazon (FBA) feature sometimes run into an issue where their FBA orders appear in the Online Store Manager with a message stating that the shipping method attached to the order is invalid, thereby preventing the proper submittal of the order to FBA for fulfillment.

This is typically caused when - after first setting up your FBA functions in the 3dcart store - you edit or otherwise add new shipping methods to your store.

As described in the FBA setup article, part of the process of configuring your FBA setup is to map your shipping methods from the store to one of three shipping methods available on FBA. When editing or adding new shipping methods to your 3dcart store, you simply need to go into the FBA settings and refresh the new methods to FBA.

To correct this, log into your 3dcart Online Store Manager and:

Use the left hand navigaito menu and go to Modules

At the top of the page, use the search bar to search for "Fulfillment By Amazon"

After the module appears, click on the "Settings" link

Once there, you will see your FBA configuration settings and your store's current shipping setting as they are mapped to the FBA service. This will include any new shipping methods you may have added since your initial set up of the FBA function.